I asked a longtime diehard Knicks fan. He said some very similar things as you about D'Antoni. He completely agreed and told me D'Antoni was terrible all season with the Knicks with lineups changes during and between games, spacing, everything else.

The Knicks roster hasn't changed that much. Of course adding Kidd is like another coach too, but outside of that they have a lot of the same guys and they're playing far better under a different system. It just makes sense that 'antoni needs to get over his ego and adjust his system.